According to Mawhinney's arrest warrant, two members of the Windsor Rod and Gun Club, Jay Lawlor and Lee McKay, were hunting there May 18, 2019, when they happened upon a 2-foot-wide, 6-foot-long, 3-feet-deep hole covered with barbecue grill grates.

Lawlor found a blue tarp and two unopened bags of lime inside the pit, the warrant said. McKay asked him, "What's the lime for?" Lawlor said, "For trying to rid of a body."

Lawlor later told police that the hole was, "one hundred percent a human grave." But the men didn't know of anyone who was missing, so they moved on.

In early June, Lawlor went back to the club "and found the hole had been filled and covered — "as neat as a pin" — with leaves and sticks so that it wasn't apparent that a hole had been there," according to the warrant.

He reported the finding to police at the end of the month. Mawhinney founded the club, but had ceased to be a member about five years ago. However, Lawlor knew that Mawhinney had contacted another member in March or April, expressing a desire to rejoin the club. He was given a key, and then stopped asking about renewing his membership, the warrant says.

Investigators went to the club to investigate the hole, and found it, but there were no signs of a body inside.

Police spoke with Mawhinney on two occasions. While Troconis told police she saw him in Dulos' house on the day Jennifer Dulos went missing, Mawhinney denied he had seen or had contact with Dulos.

Investigators pointed out that phone records indicate Dulos called Mawhinney on May 24. Still, he denied recalling any contact with his friend, claiming he had fallen on May 25 and suffered a concussion. He also had to replace his cellphone after breaking his in the fall, he told police.